Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Mycobacteriaceae, Genus
Mycobacterium, Mycobacterium chubuense (ex Tsukamura 1973) Tsukamura 1981.
Acid-fast coccoid cells. Prolonged culture may lose some acid-fastness. Mycelium not
formed. Rough mutants form spreading pellicles that contain microscopic cords.
Colonies are smooth yellow, forming in 3 days on egg-based media. Grows at 25-37
ºC, but not at 45 or 52 ºC.
Isolated from Chubu Hospital garden soil. Susceptible to hydroxylamine (500 μg/ml) and ethambutol (5 μg/ml). Resistant to
thiophene-2-carboxylic acid hydrazide (1 μg/ml), and rifampin (25 μg/ml).
Considered to be non-pathogenic.
- John G. Magee and Alan C. Ward 2012. Family III. Mycobacteriaceae Chester 1897, 63AL in Bergey’s Manual of Systematic
Bacteriology, Volume Five The Actinobacteria, Part A, Michael Goodfellow & al. (editors), 312-375.
- Julian E, Roldan M, Sanchez-Chardi A, Astola O, Agusti G, Luquin M. Microscopic cords, a virulence-related characteristic of
Mycobacterium tuberculosis, are also present in nonpathogenic mycobacteria. J Bacteriol. 2010;192(7):1751–1760. doi:10.1128
- Tsukamura M, Mizuno S, Tsukamura S. Numerical analysis of rapidly growing, scotochromogenic mycobacteria, including
Mycobacterium obuense sp. nov., nom. rev., Mycobacterium rhodesiae sp. nov., nom. rev., Mycobacterium aichiense sp. nov.,
nom. rev., Mycobacterium chubuense sp. nov., nom. rev., and Mycobacterium tokaiense sp. nov., nom. rev. Int. J. Syst. Bacteriol.
- Nouioui I, Brunet LR, Simpson D, Klenk HP, Goodfellow M. Description of a novel species of fast growing mycobacterium:
Mycobacterium kyogaense sp. nov., a scotochromogenic strain received as Mycobacterium vaccae. Int J Syst Evol Microbiol 2018;
Positive results for arylsulfatase (7 days), thermo-stable catalase, beta-esterase, beta-galactosidase, nitrate reduction, tellurite
reduction, nicotinamidase, pyrazinamidase, and urease.
Can utilize as sole carbon source acetate, succinate, malate, fumarate, fructose, glucose, pyruvate, rhamnose, sucrose and xylose.
Negative results for arylsulfatase (3 days), acid phosphatase, catalase, semiquantitative catalase test, alpha-esterase, niacin
accumulation, acetamidase, benzamidase, isonicotinamidase, alantoinase, sucinamidase, and Tween 80 hydrolysis (positive after
No utilization of acetamide, benzoate, citrate, malonate, D-galactose, D-mannose, trehalose and myo-inositol.
(c) Costin Stoica